1 /* 2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or (at 12 * your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 */ 25 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <linux/types.h> 30 #ifdef CONFIG_ACPI_PROCFS_POWER 31 #include <linux/proc_fs.h> 32 #include <linux/seq_file.h> 33 #endif 34 #ifdef CONFIG_ACPI_SYSFS_POWER 35 #include <linux/power_supply.h> 36 #endif 37 #include <acpi/acpi_bus.h> 38 #include <acpi/acpi_drivers.h> 39 40 #define ACPI_AC_CLASS "ac_adapter" 41 #define ACPI_AC_DEVICE_NAME "AC Adapter" 42 #define ACPI_AC_FILE_STATE "state" 43 #define ACPI_AC_NOTIFY_STATUS 0x80 44 #define ACPI_AC_STATUS_OFFLINE 0x00 45 #define ACPI_AC_STATUS_ONLINE 0x01 46 #define ACPI_AC_STATUS_UNKNOWN 0xFF 47 48 #define _COMPONENT ACPI_AC_COMPONENT 49 ACPI_MODULE_NAME("ac"); 50 51 MODULE_AUTHOR("Paul Diefenbaugh"); 52 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 53 MODULE_LICENSE("GPL"); 54 55 #ifdef CONFIG_ACPI_PROCFS_POWER 56 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 57 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 58 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 59 #endif 60 61 static int acpi_ac_add(struct acpi_device *device); 62 static int acpi_ac_remove(struct acpi_device *device, int type); 63 static int acpi_ac_resume(struct acpi_device *device); 64 65 static const struct acpi_device_id ac_device_ids[] = { 66 {"ACPI0003", 0}, 67 {"", 0}, 68 }; 69 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 70 71 static struct acpi_driver acpi_ac_driver = { 72 .name = "ac", 73 .class = ACPI_AC_CLASS, 74 .ids = ac_device_ids, 75 .ops = { 76 .add = acpi_ac_add, 77 .remove = acpi_ac_remove, 78 .resume = acpi_ac_resume, 79 }, 80 }; 81 82 struct acpi_ac { 83 #ifdef CONFIG_ACPI_SYSFS_POWER 84 struct power_supply charger; 85 #endif 86 struct acpi_device * device; 87 unsigned long long state; 88 }; 89 90 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); 91 92 #ifdef CONFIG_ACPI_PROCFS_POWER 93 static const struct file_operations acpi_ac_fops = { 94 .owner = THIS_MODULE, 95 .open = acpi_ac_open_fs, 96 .read = seq_read, 97 .llseek = seq_lseek, 98 .release = single_release, 99 }; 100 #endif 101 #ifdef CONFIG_ACPI_SYSFS_POWER 102 static int get_ac_property(struct power_supply *psy, 103 enum power_supply_property psp, 104 union power_supply_propval *val) 105 { 106 struct acpi_ac *ac = to_acpi_ac(psy); 107 switch (psp) { 108 case POWER_SUPPLY_PROP_ONLINE: 109 val->intval = ac->state; 110 break; 111 default: 112 return -EINVAL; 113 } 114 return 0; 115 } 116 117 static enum power_supply_property ac_props[] = { 118 POWER_SUPPLY_PROP_ONLINE, 119 }; 120 #endif 121 /* -------------------------------------------------------------------------- 122 AC Adapter Management 123 -------------------------------------------------------------------------- */ 124 125 static int acpi_ac_get_state(struct acpi_ac *ac) 126 { 127 acpi_status status = AE_OK; 128 129 130 if (!ac) 131 return -EINVAL; 132 133 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 134 if (ACPI_FAILURE(status)) { 135 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 136 ac->state = ACPI_AC_STATUS_UNKNOWN; 137 return -ENODEV; 138 } 139 140 return 0; 141 } 142 143 #ifdef CONFIG_ACPI_PROCFS_POWER 144 /* -------------------------------------------------------------------------- 145 FS Interface (/proc) 146 -------------------------------------------------------------------------- */ 147 148 static struct proc_dir_entry *acpi_ac_dir; 149 150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 151 { 152 struct acpi_ac *ac = seq->private; 153 154 155 if (!ac) 156 return 0; 157 158 if (acpi_ac_get_state(ac)) { 159 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 160 return 0; 161 } 162 163 seq_puts(seq, "state: "); 164 switch (ac->state) { 165 case ACPI_AC_STATUS_OFFLINE: 166 seq_puts(seq, "off-line\n"); 167 break; 168 case ACPI_AC_STATUS_ONLINE: 169 seq_puts(seq, "on-line\n"); 170 break; 171 default: 172 seq_puts(seq, "unknown\n"); 173 break; 174 } 175 176 return 0; 177 } 178 179 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 180 { 181 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 182 } 183 184 static int acpi_ac_add_fs(struct acpi_device *device) 185 { 186 struct proc_dir_entry *entry = NULL; 187 188 189 if (!acpi_device_dir(device)) { 190 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 191 acpi_ac_dir); 192 if (!acpi_device_dir(device)) 193 return -ENODEV; 194 acpi_device_dir(device)->owner = THIS_MODULE; 195 } 196 197 /* 'state' [R] */ 198 entry = proc_create_data(ACPI_AC_FILE_STATE, 199 S_IRUGO, acpi_device_dir(device), 200 &acpi_ac_fops, acpi_driver_data(device)); 201 if (!entry) 202 return -ENODEV; 203 return 0; 204 } 205 206 static int acpi_ac_remove_fs(struct acpi_device *device) 207 { 208 209 if (acpi_device_dir(device)) { 210 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 211 212 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 213 acpi_device_dir(device) = NULL; 214 } 215 216 return 0; 217 } 218 #endif 219 220 /* -------------------------------------------------------------------------- 221 Driver Model 222 -------------------------------------------------------------------------- */ 223 224 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 225 { 226 struct acpi_ac *ac = data; 227 struct acpi_device *device = NULL; 228 229 230 if (!ac) 231 return; 232 233 device = ac->device; 234 switch (event) { 235 default: 236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 237 "Unsupported event [0x%x]\n", event)); 238 case ACPI_AC_NOTIFY_STATUS: 239 case ACPI_NOTIFY_BUS_CHECK: 240 case ACPI_NOTIFY_DEVICE_CHECK: 241 acpi_ac_get_state(ac); 242 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 243 acpi_bus_generate_netlink_event(device->pnp.device_class, 244 dev_name(&device->dev), event, 245 (u32) ac->state); 246 #ifdef CONFIG_ACPI_SYSFS_POWER 247 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 248 #endif 249 } 250 251 return; 252 } 253 254 static int acpi_ac_add(struct acpi_device *device) 255 { 256 int result = 0; 257 acpi_status status = AE_OK; 258 struct acpi_ac *ac = NULL; 259 260 261 if (!device) 262 return -EINVAL; 263 264 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 265 if (!ac) 266 return -ENOMEM; 267 268 ac->device = device; 269 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 270 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 271 device->driver_data = ac; 272 273 result = acpi_ac_get_state(ac); 274 if (result) 275 goto end; 276 277 #ifdef CONFIG_ACPI_PROCFS_POWER 278 result = acpi_ac_add_fs(device); 279 #endif 280 if (result) 281 goto end; 282 #ifdef CONFIG_ACPI_SYSFS_POWER 283 ac->charger.name = acpi_device_bid(device); 284 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 285 ac->charger.properties = ac_props; 286 ac->charger.num_properties = ARRAY_SIZE(ac_props); 287 ac->charger.get_property = get_ac_property; 288 power_supply_register(&ac->device->dev, &ac->charger); 289 #endif 290 status = acpi_install_notify_handler(device->handle, 291 ACPI_ALL_NOTIFY, acpi_ac_notify, 292 ac); 293 if (ACPI_FAILURE(status)) { 294 result = -ENODEV; 295 goto end; 296 } 297 298 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 299 acpi_device_name(device), acpi_device_bid(device), 300 ac->state ? "on-line" : "off-line"); 301 302 end: 303 if (result) { 304 #ifdef CONFIG_ACPI_PROCFS_POWER 305 acpi_ac_remove_fs(device); 306 #endif 307 kfree(ac); 308 } 309 310 return result; 311 } 312 313 static int acpi_ac_resume(struct acpi_device *device) 314 { 315 struct acpi_ac *ac; 316 unsigned old_state; 317 if (!device || !acpi_driver_data(device)) 318 return -EINVAL; 319 ac = acpi_driver_data(device); 320 old_state = ac->state; 321 if (acpi_ac_get_state(ac)) 322 return 0; 323 #ifdef CONFIG_ACPI_SYSFS_POWER 324 if (old_state != ac->state) 325 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 326 #endif 327 return 0; 328 } 329 330 static int acpi_ac_remove(struct acpi_device *device, int type) 331 { 332 acpi_status status = AE_OK; 333 struct acpi_ac *ac = NULL; 334 335 336 if (!device || !acpi_driver_data(device)) 337 return -EINVAL; 338 339 ac = acpi_driver_data(device); 340 341 status = acpi_remove_notify_handler(device->handle, 342 ACPI_ALL_NOTIFY, acpi_ac_notify); 343 #ifdef CONFIG_ACPI_SYSFS_POWER 344 if (ac->charger.dev) 345 power_supply_unregister(&ac->charger); 346 #endif 347 #ifdef CONFIG_ACPI_PROCFS_POWER 348 acpi_ac_remove_fs(device); 349 #endif 350 351 kfree(ac); 352 353 return 0; 354 } 355 356 static int __init acpi_ac_init(void) 357 { 358 int result; 359 360 if (acpi_disabled) 361 return -ENODEV; 362 363 #ifdef CONFIG_ACPI_PROCFS_POWER 364 acpi_ac_dir = acpi_lock_ac_dir(); 365 if (!acpi_ac_dir) 366 return -ENODEV; 367 #endif 368 369 result = acpi_bus_register_driver(&acpi_ac_driver); 370 if (result < 0) { 371 #ifdef CONFIG_ACPI_PROCFS_POWER 372 acpi_unlock_ac_dir(acpi_ac_dir); 373 #endif 374 return -ENODEV; 375 } 376 377 return 0; 378 } 379 380 static void __exit acpi_ac_exit(void) 381 { 382 383 acpi_bus_unregister_driver(&acpi_ac_driver); 384 385 #ifdef CONFIG_ACPI_PROCFS_POWER 386 acpi_unlock_ac_dir(acpi_ac_dir); 387 #endif 388 389 return; 390 } 391 392 module_init(acpi_ac_init); 393 module_exit(acpi_ac_exit); 394